My sides are about 2ft back from the main listening position, but about 3ft ahead of the 2nd row of seating. It's a compromise I think you have to make with multiple row seating.

LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7